A man turned to the woman seated next to him on an airplane and said, “What’s that book you’re reading?”

“The New Pearl Harbor by David Ray Griffin.”

“What’s it about?”

“It’s about how the Bush Administration orchestrated the 9/11 attacks so they could invade the Middle East.”

The man’s jaw dropped, his face slowly turned red, and he said “That’s so ridiculous it’s not even worth discussing.” Silence.

The woman said, "Okay, then. A horse, a cow, and a deer all eat grass. The same stuff. Yet a deer excretes little pellets while a cow turns out a flat patty, and a horse produces clumps of dried grass. Why do you suppose that is?"

"Jeez," said the man. "I have no idea."

"Well, then," the woman said, "How is it that you think you know what happened on 9/11 when you don't know shit?”